[Kipplur]

Hey all, I just picked up a 2020 330i and absolutely love it!


I wanted to keep the stock exhaust so I can keep the valves, I was wondering how much of a difference getting a catless downpipe would alter the exhaust notes, would it pop and crackle more? Also throwing a check engine light is a concern!

Please and thank you!

[dfwF30bmw]

Best performance upgrade for me running without a tune at the time. You will get some burbbles too as a result. As for check engine light, if you get the downstream O2 sensor spaced just right I did not get a check engine light. I had over 3000 miles on stock tune and only get it at 50 miles and then 250 miles and that is when third time with proper spacer no light for 3000 miles until I went to a tune which can be set to cancel it out.

[Kipplur]

Originally Posted by dfwF30bmw

Best performance upgrade for me running without a tune at the time. You will get some burbbles too as a result. As for check engine light, if you get the downstream O2 sensor spaced just right I did not get a check engine light. I had over 3000 miles on stock tune and only get it at 50 miles and then 250 miles and that is when third time with proper spacer no light for 3000 miles until I went to a tune which can be set to cancel it out.

You went catless on the g20 330i?

Do you happen to have an exhaust video? And is everything past the downpipe stock?